Now let's move on to the bone that is
commonly known as our cheekbone, the zygomatic.
The zygomatic bone is yet another
which contributes to the
formation of the following structures:
First, it forms a floor in the
lateral wall, the ocular orbit.
Second, it contributes to the formation
of the temporal and infratemporal fossae.
And lastly, it completes the zygomatic arch or
what's commonly known as the cheek prominence.
Now, if you recall, we divided
the frontal bone into different parts.
We have to do the same with zygomatic bone.
This bone is described as having 3
surfaces, 5 borders and 2 processes.
We will now discuss each
of these parts in more detail.
Let us begin our discussion with zygomatic bone.
The first and most visible
surface is the lateral facial surface.
This convex surface forms our cheek.
Here, a zygomaticofacial foramen can be found
which transmits nerves and vessels of the same name.
Furthermore, the muscles of the zygomaticus
major and minor also find their insertions
on the facial surface of the zygomatic bone.
Behind and more medial to the facial
surface is the posteromediotemporal surface.
The anterior area, the posteromedial surface is rubbed
as it articulates with the zygomatic process of the maxilla.
While the posterior area, the same
surface is smooth and concave.
The posterior is also the site for the
opening of the zygomaticotemporal foramen.
And the last surface of the
zygomatic bone is the oral surface.
This is a smooth surface which gives rise to
the floor and the lateral wall of the orbital cavity.
Now let us continue our overview of the
zygomatic bone by discussing its five borders.
The first of the five borders of the zygomatic
bone is the anterosuperior orbital border
which forms the inferolateral
circumference of the orbit.
The second is the anteroinferior
maxillary border through which
the zygomatic articulates with the maxilla.
The third is the posterosuperior
temporal border, which is L shaped
and whose vertical edge is continuous
with the frontal process of the zygomatic,
and the horizontal edge is
continuous with the zygomatic arch.
The fourth is the posteroinferior border
to which the masseter muscle attaches.
And lastly, the fifth is the posteromedial border,
which articulates with a greater wing of the sphenoid
and the oral surface of the maxilla.
And to conclude our discussion of
zygomatic, its processes have to be mentioned.
As I previously mentioned or
said there are two processes.
The frontal process which articulates with
the zygomatic process of the frontal bone,
and with the greater wing of the sphenoid posteriorly,
and the temporal process, which extends to articulate
with the zygomatic process of the temporal bone.
And then this slide concludes
our discussion of zygomatic bone